New Constraints on Primordial Minihalo Abundance Using Cosmic Microwave Background Observations

Abstract

It was proposed that the massive compact halo objects (MCHOs) would be produced during an earlier epoch of cosmology if the density perturbations are between $3\times 10^{-4}$ and 0.3. Then these objects can accrete dark matter particles onto them due to their high density. If the dark matter is in the form of the weakly interacting massive particles, the MCHOs can have a significant effect on the evolution of cosmology due to the dark matter annihilation within them. Using the WMAP-7 years data, we investigated the constraints on the current abundance of MCHOs ($f_{MCHOs}$) formed during the $e^{+}{e}^{-}$ annihilation phase transition. We have found that the $2\sigma$ constraint is $f_{MCHOs}\lesssim 10^{-4}$ for dark matter masses in the range between 1 GeV and 1 TeV.

arXiv comment4 pages, 3 figures. An error has been corrected. Some references are added following the suggestion of Pat Scott. The final results are not changed

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Cited by in corpus (23)

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• Small-scale clumps of dark matter
• Are ultracompact minihalos really ultracompact?
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• Formation and internal structure of superdense dark matter clumps and ultracompact minihaloes
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• Number Counts and Non-Gaussianity
• Ultracompact minihalos as probes of inflationary cosmology
• Constraints on ultracompact minihalos from extragalactic γ-ray background
• Neutrino signals from ultracompact minihalos and constraints on the primordial curvature perturbation
• Contributions of dark matter annihilation to the global 21cm spectrum observed by the EDGES experiment
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• The contribution of ultracompact dark matter minihalos to the isotropic radio background
• The Abundance of New Kind of Dark Matter Structures
• Hunting for dark halo substructure using submilliarcsecond-scale observations of macrolensed radio jets
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• Constraints on the basic parameters of dark matter using the Planck data
• Constraints on cosmic strings from ultracompact minihalos
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• Constraints on ultracompact minihalos from the extragalactic gamma-ray background observation
• Constraints on the ultracompact minihalos using neutrino signals from the gravitino dark matter decay